# Example of embedding CEF Python browser using wxPython library.
# This example has a top menu and a browser widget without navigation bar.

# Tested configurations:
# - wxPython 4.0 on Windows/Mac/Linux
# - wxPython 3.0 on Windows/Mac
# - wxPython 2.8 on Linux
# - CEF Python v66.0+
import sys
import platform

import wx
from cefpython3 import cefpython as cef
from cef_utils import *
from cef_frame import MainFrame


def main():
    check_versions()
    sys.excepthook = cef.ExceptHook  # To shutdown all CEF processes on error
    settings = {}
    if MAC:
        # Issue #442 requires enabling message pump on Mac
        # and calling message loop work in a timer both at
        # the same time. This is an incorrect approach
        # and only a temporary fix.
        settings["external_message_pump"] = True
        settings["remote_debugging_port"] = 8088
        settings["debug"] = True
        # settings["webgl_disabled"] = True

    if WINDOWS:
        # noinspection PyUnresolvedReferences, PyArgumentList
        cef.DpiAware.EnableHighDpiSupport()
    cef.Initialize(settings=settings)
    app = CefApp(False)
    app.MainLoop()
    del app  # Must destroy before calling Shutdown
    if not MAC:
        # On Mac shutdown is called in OnClose
        cef.Shutdown()


def check_versions():
    print("[wxpython.py] CEF Python {ver}".format(ver=cef.__version__))
    print("[wxpython.py] Python {ver} {arch}".format(
        ver=platform.python_version(), arch=platform.architecture()[0]))
    print("[wxpython.py] wxPython {ver}".format(ver=wx.version()))
    # CEF Python version requirement
    assert cef.__version__ >= "66.0", "CEF Python v66.0+ required to run this"


class CefApp(wx.App):

    def __init__(self, redirect):
        self.timer = None
        self.timer_id = 1
        self.is_initialized = False
        super(CefApp, self).__init__(redirect=redirect)

    def OnPreInit(self):
        super(CefApp, self).OnPreInit()
        # On Mac with wxPython 4.0 the OnInit() event never gets
        # called. Doing wx window creation in OnPreInit() seems to
        # resolve the problem (Issue #350).
        if MAC and wx.version().startswith("4."):
            print("[wxpython.py] OnPreInit: initialize here"
                  " (wxPython 4.0 fix)")
            self.initialize()

    def OnInit(self):
        self.initialize()
        return True

    def initialize(self):
        if self.is_initialized:
            return
        self.is_initialized = True
        self.create_timer()
        frame = MainFrame()
        self.SetTopWindow(frame)
        frame.Show()

    def create_timer(self):
        # See also "Making a render loop":
        # http://wiki.wxwidgets.org/Making_a_render_loop
        # Another way would be to use EVT_IDLE in MainFrame.
        self.timer = wx.Timer(self, self.timer_id)
        self.Bind(wx.EVT_TIMER, self.on_timer, self.timer)
        self.timer.Start(10)  # 10ms timer

    def on_timer(self, _):
        cef.MessageLoopWork()

    def OnExit(self):
        self.timer.Stop()
        return 0


if __name__ == '__main__':
    main()
